//
//  Atom.h
//  oc
//
//  Created by mac on 16-4-7.
//  Copyright (c) 2016年 wangchenglong. All rights reserved.
//

#import <Foundation/Foundation.h>

@interface Atom : NSObject
@property (readonly) NSUInteger protons;
@property (readonly) NSUInteger neutrons;
@property (readonly) NSUInteger electrons;
@property (readonly) NSString*chemicalElement;
-(NSUInteger) massNumber;
@end
